On Thu, 08 Jun 2006 10:57:42 -0700, kell wrote:
> did kick up a lot of corrosive mist.
>> My question, how do most of you home etchers dispose of the exhausted
>> solution? Different areas probably have their own rules on this.
> I don't have the link, but somewhere I read about a two-step process
> that turns ferric chloride into rust and (I think) table salt. I think
> it uses baking soda and some other common household chemical...
> anybody got info on this?
Washing Soda. It's Sodium Carbonate, Na2CO3, and doesn't release hydrogen
as it works. It turns the iron and copper ions into their carbonates,
which are essentially just dirt, and the sodium eats the chlorine. :-)
I did a board once with about a pint of RS FeCl3, and just flushed it
when I was done. The EPA hasn't shown up to clap me in irons, yet. ;-)